GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
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GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-V (NEW) EXAMINATION - WINTER 2018
Subject Code: 2151303
Subject Name: Physico - Chemical Treatment Technologies
Time: 10:30 AM TO 01:00 PM
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 | (a) | Give the difference between Primary Treatment and Advanced Treatment. | 03 | ||||||||||||||
| (b) | Differentiate between Surface Water Treatment & Ground Water Treatment. | 04 | |||||||||||||||
| (c) | Write a Short note on “Aerated Grit Chamber”. Draw a line sketch of it. | 07 | |||||||||||||||
| Q.2 | (a) | Which factors affect on Headloss of Screens. Explain each in detail. | 03 | ||||||||||||||
| (b) | Explain the importance of Alkalinity in Coagulation. | 04 | |||||||||||||||
| (c) | Estimate the headloss for a clean bar rack and 50% blockage of bar rack. Assume following data: 1. Approach Velocity in channel = 0.53 m/s --- Content provided by FirstRanker.com --- 2. Velocity through Clean Screen = 0.93 m/s3. Empirical discharge coefficient when bar rack is clean & blocked =1.67& 1.43 respectively. | 07 | |||||||||||||||
| OR | |||||||||||||||||
| Q.2 | (a) | Enlist different types of Flocculators. Explain any one. | 03 | ||||||||||||||
| (b) | Explain the term “Zeta Potential” with neat sketch. | 04 | |||||||||||||||
| (c) | A bar screen is inclined at 60° angle from horizontal. The rectangular bars have width 15 mm & spacing 20 mm. Total Number of spacing are 25. Determine the headloss when the bars are clean & Velocity approaching the screen is 1 m/s. Assume bar shape factor is 1.83 | 07 | |||||||||||||||
| Q.3 | (a) | A rectangular sedimentation tank has a length of 8 m and a width of 5 m. For a flow rate of 1 MLD, calculate the Weir Overflow Rate. | 03 | ||||||||||||||
| (b) | Assuming the diameter of a clarifier to be 18 m and the wastewater flowrate 9 MLD. Calculate the detention time and Surface Loading Rate of the clarifier having a wastewater depth of 2.4 m | 04 | |||||||||||||||
| (c) | Derive Stock’s Law for settling of discrete particle when flow pattern is Laminar. | 07 | |||||||||||||||
| OR | |||||||||||||||||
| Q.3 | (a) | Define: Scour Velocity & Terminal Velocity. | 03 | ||||||||||||||
| (b) | Write a short note on Tube Settler. | 04 | |||||||||||||||
| (c) | Find the terminal settling velocity of spherical particle with a diameter 0.5 mm and specific gravity 2.65 settling through water. Assume that Kinematic Viscosity 1.004 X 10-5 m²/s. | 07 | |||||||||||||||
| Q.4 | (a) | Explain mechanism of Suspended Solid removal in filter. | 07 | ||||||||||||||
| (b) | Write the working of Rapid Sand Filter with neat sketch. | 03 | |||||||||||||||
| (c) | Explain the Chlorine reactions with Ammonia at different pH and define combined chlorine. | 04 | |||||||||||||||
| OR | |||||||||||||||||
| Q.4 | (a) | Explain the term Pre-Chlorination and Super Chlorination. | 07 | ||||||||||||||
| (b) | Give the comparison between Chlorine and Ozone as a disinfectant. | 03 | |||||||||||||||
| (c) | Define: Sludge Dewatering & Sludge Thickening. Mention the %solids content of Dewatered Sludge & Thickened Sludge. | 04 | |||||||||||||||
| Q.5 | (a) | Highlight the components of Filter Press in a sketch. Explain the process & Enlist advantages & disadvantages of it. | 07 | ||||||||||||||
| (b) | Explain reaction Chemistry of following Coagulants: i. Alum and ii. Lime | 03 | |||||||||||||||
| (c) | Give the Drinking Water Permissible Limit and explain the importance of following parameters: 1. Fluoride ii. Total Dissolved Solids iii. Nitrates | 04 | |||||||||||||||
| OR | |||||||||||||||||
| Q.5 | (a) | Explain the Principle on which Decanter works. Enlist the components & explain purpose of each component with neat sketch. | 07 | ||||||||||||||
| (b) | Settling Column Tests on a Discrete Particle Suspension gave the following results from a depth to 1.3m.
| 03 | |||||||||||||||
| (c) | Determine the theoretical removal of solids from this suspension in a horizontal flow sedimentation tank with Surface Overflow Rate of 200 m³/m²/day. | 04 |
Date: 27/11/2018
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Total Marks: 70
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